>> caller: this is mike in the windy city, giving you a chicago bears ba-ba-ba boo-yah. >> bears are constant. what's up? >> caller: if i'm short a stock, how long do i have to cover the short? >> forever. forever. that's one of the great things about shorting. stay short for as long as you want. remember, if the stock goes up, they may ask you to put more money up, though. that's where people get squeezed. okay, you got to dig deep if you want deep profits. gross margins will guide you in figuring out the direction of a stock. some things you only find on the conference calls, not the headlines. gross margins, that's on the call. stay with cramer. >>> nobody is more passionate about the market than i am. nobody in this whole country! >> i wanted to thank you. you have saved my retirement. >> you are why i come out here and do this show. thank you so much. >> caller: the stuff that you're doing for all of us is so important. i want to say thank you. >> caller: my husband and i watch every day, and we count on your help for small investors like us. >> put cramer's 30-plus years of exp